Choosing to use your phone as a payment method is exactly that...a choice. LCFC have not given us a choice.
And anyway, it's not as easy to use digital ticketing as it is to pay for stuff. For entry to the ground you have to select the specific match ticket, so each game requires "maintenance" of your phone wallet (see the Foxes Trust thread and read the minutes for the troubles some people have). You don't need to do that every time you want to pay for something, you only have to add your payment card once and don't ever have to "maintain" it.